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Force Sensitive Resistor are resistive sensor exhibiting vary resistance that responds to force applied to the sensing area. As force on the sensor is increased, resistance is decreased.
For the single -zone sensors, as the sensor is a Two-terminal device that can essentially be treated as a variable resistor whose value is controlled by applied force, and also a switch whose threshold is controlled by applied force and setting up.
The sensors are made up of robust polyester film, high-conductive material and Nano-sized force sensing material. The top layer of the sensor consists of the area of force sensitive layer on a flexible film. And bottom layer is comprised of conductive circuit traces on a flexible film. And the above two layers are S are stick together by spacer adhesive and active area is without adhesive. When the active area is applied force, force sensitive layer on the top layer shunts the circuit traces on the bottom, varying resistance output terminals.
|Thickness||0.2mm with Rear ADH|
|Actuation force||5g Res. lt;=200K2|
|Sensitivity range||5g to 600g|
|Resolution||5g to 600g|
|Operating temperature||-40C~+ 85C|
|Life time||gt;1 million|
|Repeatability same part||+/-5%ï¼Ave. R@500g|
|Repeatability part to part||+/- 15%, Ave. R@500g|
|Hysteresis||+ 10%, (RF+ - RF- )/FR+ , @500g|
|EMI||Generates no EMI|
|EDS||not ESD sensitive|
|Drift||lt;10%, 500g load, 24H|
The first plot shows an example response resistance curve, when the sensor actuated by a force curve tester.
The second plot shows an near-linear curve which is 1/R at F.
The sensor is placed in series with a fixed resistor (R0), and output voltage is measured across RO. It is given by Vout=Vcc* RO/(R0+Rs).
How to define the fixed resistor value, Basically, RO is 1/3 to 1/2 of the resistance range of Rs. WhatâS more, if RO is appropriate, you can get a near-linearcurve of Force VS Vout in a special force range. Depending on the impedance requirements of the measuring circuit, the voltage divider could be followed by an op-amp.
This is an ideal circuit for applications that require on-off switching at a specified force.
It consists a Wheatstone bridge circuit and a voltage comparator.
When apply force and Rs becomes to be lower than R1, lead U1+ to be higher than U1-, and Vout becomes to be high. This high level signal can used to be trigger signal of following devices, for example, it can trigger a relay, and then control LEDs, buzzer warning, motor and other load devices.
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